Preparation of polystyrene-based activated carbon spheres with high surface area and their adsorption to dibenzothiophene

Wang, Qin; Liang, Xia; Qiao, Wenming; Liu, Chaojun; Liu, Xiaojun; Zhan, Liang; Ling, Licheng

doi:10.1016/j.fuproc.2008.10.008

Cited by 113 publications

(72 citation statements)

References 42 publications

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“…Porosity and surface chemistry were indicated as important factors for selective desulfurization on activated carbons, [1,6,8,9,11,14,16,18] hence, the surface of the adsorbents was thoroughly analyzed. The parameters of the porous structure calculated from nitrogen adsorption isotherms and the pore size distributions are shown in Table 1 and Figure 4, respectively.…”

Section: Resultsmentioning

confidence: 99%

Enhancement in Dibenzothiophene Reactive Adsorption from Liquid Fuel via Incorporation of Sulfur Heteroatoms into the Nanoporous Carbon Matrix

2010

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Adsorption of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (DMDBT) from simulated diesel fuel was investigated with polymer-derived carbon matrices. Sulfur was incorporated to the carbon surface via a high-temperature hydrogen sulfide reduction of oxygen-containing groups. The resultant carbons were characterized by nitrogen adsorption, thermal analysis, potentiometric titration, and elemental analysis. The selectivities for DBT and DMDBT adsorption were calculated with reference to naphthalene. The carbon matrices studied had comparable structures, hence, the effects of the sulfur functionalities were evident in an increase in dibenzothiophenes selectivity and the breakthrough capacity; this was especially visible at a breakthrough point where small pores are expected to be active in the adsorption process. Incorporation of sulfur atoms into the aromatic rings of the carbon matrix increases the ability of the surface to attract dibenzothiophenes via dispersive interactions (sulfur-sulfur bridges). Sulfur and sulfur-oxygen groups present in larger pores enhance the amount of adsorbed dibenzothiophenes via specific acid-base and polar interactions. They also contribute to the reactive adsorption of DBT and DMDBT (oxidized) and their chemisorption on the carbon surface.

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Section: Resultsmentioning

confidence: 99%

Enhancement in Dibenzothiophene Reactive Adsorption from Liquid Fuel via Incorporation of Sulfur Heteroatoms into the Nanoporous Carbon Matrix

2010

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“…Scientific efforts focus on oxidation [1,2], photoxidation [3,4] or adsorption . The adsorption based methods applied activated alumina [7,8], zeolites [9], and activated carbons [7,[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] as adsorbents. The results obtained on the latter materials seem promising [12,22,[26][27][28].…”

Section: Introductionmentioning

confidence: 99%

“…Especially pores smaller than 7 or 10 Å play a role since they are similar in their sizes to DBT and DMDBT molecules and thus enhance the adsorption potential [10,12,18,22,25,26]. Larger pores, even though they do not attract strongly the adsorbates via dispersive forces, also play a significant role in enhancing the capacity and selectivity when functional groups are located on their surface.…”

Section: Introductionmentioning

confidence: 99%

Role of phosphorus in carbon matrix in desulfurization of diesel fuel using adsorption process

Seredych

Wu²,

Brender

et al. 2012

Fuel

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Adsorptive removal of dibenzothiophene (DBT) and 4, from model diesel fuel with 20 ppmw total concentration of sulfur was investigated on polymerderived carbons with incorporated heteroatoms of oxygen, sulfur and phosphorus. The materials before and after exposure to model diesel fuel were characterized using adsorption of nitrogen, thermal analysis, potentiometric titration, XPS and elemental analysis. The selectivities for DBT and DMDBT adsorption were calculated with reference to naphthalene. The results indicated that the presence of phosphorus, especially in the form of pyrophosphates and P 2 O 5 , increases the capacity and selectivity for removal of dibenzothiophenes. It also affects the adsorption mechanism. Phosphorus suppresses oxidation reactions of DBT and DMDBT. Owing to a possible location of bulky phosphorus groups in pore with sizes between 10-30 Å thiophenic molecules are strongly adsorbed there via dispersive forces. Acidic environment also enhances adsorption via acid-base interactions. Physical adsorption mechanism and stability of surface make these carbons attractive candidates for thermal regeneration.

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“…Adsorption is recognized as a generally efficient and economical process to remove organic compounds from an aqueous solution due to the low-energy consumption, ability to operate at ambient temperature and pressure, and to regenerate the spent adsorbent, plus the often broad availability of adsorbents [27]. One such abundant and relatively cheap adsorbent is activated carbon (AC), which can be prepared by physical or chemical activation methods or by a combination of both [28].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the temperatures used in chemical activation are lower than those used in the physical activation process, resulting in the development of a better porous structure and catalytic activity compared to that derived from the physical activation process [30]. Chemical activation typically uses alkali and alkaline earth metal-containing substances and some acids, such as KOH [27,[31][32][33], NaOH [34,35], HNO 3 [36], ZnCl 2 [37][38][39], and H 3 PO 4 [40][41][42], as activators, and various types of carbonaceous materials, such as coal-tar pitch, biomass, and industrial and domestic wastes, as the carbon source.…”

Section: Introductionmentioning

confidence: 99%

Preparation of sludge-derived KOH-activated carbon for crude glycerol purification

Hunsom

Autthanit

2015

J Mater Cycles Waste Manag

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Activated carbon (AC) was prepared from wastewater treatment sludge by KOH activation and then used for the adsorptive purification of crude glycerol (CG). The effect of different KOH: char (w/w) ratios (1-6), KOH soaking times (5-25 h), and activation temperatures (500-900°C) on the surface properties of the obtained sludge-derived ACs and their adsorption capacity for impurities in H 3 PO 4 pretreated CG was explored. The preparation conditions affected the textural properties and surface chemistry of the sludge-derived AC and its efficiency in the adsorptive purification of CG. Oxygen-containing surface functional groups, particularly carbonyl groups, as well as the textural properties, played a more important role in the adsorptive purification of CG. Among the sludge-derived ACs, the one impregnated at a KOH: char (w/w) ratio of 5.0 for 25 h and then activated at 800°C exhibited the most suitable surface properties for the purification of pretreated CG, attaining a 93.0 % (w/w) glycerol level at an AC dose of 67 g/L for 2 h with agitation at 250 rpm. The AC adsorption of impurities from the pretreated CG followed the Langmuir isotherm. However, the reusability of the used AC by hexane or diethyl ether extraction was not suitable.

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Preparation of polystyrene-based activated carbon spheres with high surface area and their adsorption to dibenzothiophene

Cited by 113 publications

References 42 publications

Enhancement in Dibenzothiophene Reactive Adsorption from Liquid Fuel via Incorporation of Sulfur Heteroatoms into the Nanoporous Carbon Matrix

Enhancement in Dibenzothiophene Reactive Adsorption from Liquid Fuel via Incorporation of Sulfur Heteroatoms into the Nanoporous Carbon Matrix

Role of phosphorus in carbon matrix in desulfurization of diesel fuel using adsorption process

Preparation of sludge-derived KOH-activated carbon for crude glycerol purification

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